1993 Cobra w/ B303 cam:What length pushrods? - Ford Mustang Forums : Corral.net Mustang Forum
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Old 05-12-2007, 03:58 AM   #1
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1993 Cobra w/ B303 cam:What length pushrods?

Just like the title says. I have a 93 Cobra, motor is stock except for a FRPP B303 cam. I want to be sure that the pushrods (stock) that were used were the proper length when this cam was put in (By previous owner). So my question is what length pushrods are needed with this cam in the 93 cobra motor (1.7 rockers, etc.). Will the stock length pushrods work? Any input or experiences are welcome. Thanks in advance.
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Old 05-12-2007, 04:06 AM   #2
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Yes, they will.
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Old 05-12-2007, 04:10 PM   #3
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The valve train on these cars are only marginally adjustable. Anytime a camshaft is changed, you should use a pushrod length checker to determine the proper length pushrod to use. If the stock block/heads haven't been cut, then the stock pushrods may work -- the B cam is designed with the same base circle dimension as the stock HO and Cobra cams. However, you won't know for sure until you check. If the stock pushrods turn out to be a bit too long, it's easy to shim the rockers up in .030" increments. If, on the other hand, optimum geometry indicates that they're too short - then you'll have to order longer pushrods.

Lastly -- what happened in someone else's application even with the same parts isn't predictive of what's gonna happen in your engine. When you start measuring things down in the hundredths and thousandths of an inch, every engine/combo is unique - even those running the 'same' parts.
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Old 05-12-2007, 07:46 PM   #4
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very well said Michael. A few hundredths might as well be a mile in valvetrain geometry. You should check no matter what when you change anything
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Old 05-13-2007, 03:27 AM   #5
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check the length.
It will be worth the time / effort


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Old 05-13-2007, 11:24 AM   #6
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If you are wondering I believe the stock pushrods are 6.27"
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